Agilent Technologies 87405C Service manual

Operating and Service Manual
Agilent 87405C
Preamplifier
Manufacturing Part Number: 87405-90001
Printed in Malaysia
Print Date: December 2006
© Copyright Agilent Technologies, Inc 2006

Notices
Agilent 87405C Preamplifier Operating and Service
Manual
ii
Notices
© Agilent Technologies, Inc. 2006
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Manual Part Number
87405-90001
Edition
First edition, December 2006
Printed in Malaysia
Agilent Technologies, Inc.
Phase 3 Bayan Lepas Free Industrial Zone
Bayan Lepas, Penang 11900 Malaysia
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WEEE Compliance
Agilent 87405C Preamplifier Operating and Service
Manual iii
WEEE Compliance
This product complies with the WEEE Directive (2002/96/EC) marking
requirements. The affixed label indicates that you must not discard this
electrical/electronic product in domestic household waste.
Product Category: With reference to the equipment types in the WEEE Directive
Annex I, this product is classed as a "Monitoring and Control Instrumentation"
product.
Do not dispose in domestic household waste.
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Contacting Agilent (Americas, Asia Pacific & Japan)
Agilent 87405C Preamplifier Operating and Service
Manual
iv
Contacting Agilent (Americas, Asia Pacific & Japan)
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Contacting Agilent (Europe)
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Manual v
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Contacting Agilent (Europe)
Agilent 87405C Preamplifier Operating and Service
Manual
vi

Contents
Agilent 87405C Preamplifier Operating and Service
Manual vii
Contents
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
WEEE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Printing Copies of Documentation from the Web . . . . . . . . . . . . . . . . . . . .iii
Contacting Agilent (Americas, Asia Pacific & Japan). . . . . . . . . . . . . . . . . iv
Contacting Agilent (Europe) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Preamplifier Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operator’s Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Contents
Agilent 87405C Preamplifier Operating and Service
Manual
viii

General Information
Agilent 87405C Preamplifier Operating and Service
Manual 1
General Information
Preamplifier
Overview The Agilent 87405C preamplifier offers reliable gain and low noise figure to
measurements systems, thus improve overall system performance and
reduce systematic errors. With the ability to be powered directly from the
instrument probe-port, it eliminates the need for a separate power supply.
The 87405C is ideal for use as the front end preamplifier for a variety of
Agilent instruments such as PSA, ESA as well as the MXA series of
spectrum analyzer. The rugged Type N connectors make the 87405C well
suited for various field applications.
Figure 1 87405C Preamplifier
Refer to Table 1 for general information of 87405C preamplifier..
Table 1 General Information of 87405C Preamplifier
Model Frequency Range Small Signal Gain Connector Type
87405C 100 MHz to 18 GHz 25 dB Type N (m), (f)

General Information
Agilent 87405C Preamplifier Operating and Service
Manual
2
Features •DC bias via probe-power port on Agilent instruments eliminates the
need for additional power supply
•Low noise figure of 4.5 dB and high gain of 25 dB reduces total system
noise figure for better equipment dynamic range and sensitivity
•Compact design and portability allows usage in the field (Installation &
Maintanence applications)
•High P1dB of 15 dBm increases available power from network analyzer
and signal source
Application Low Level Signal Measurement
In low level signal measurement, the sensitivity of the measurement system
can be improved by adding a preamplifier into the system as illustrated in
Figure 2.
Total noise figure of the system can also be reduced using a preamplifier as
the noise figure of the system is dominated by the noise figure of the
preamplifier.
Figure 2 Low level Signal Measurement Test Setup
DUT
Preamp
DUT
Preamp

Specifications
Agilent 87405C Preamplifier Operating and Service
Manual 3
Specifications
Specifications refer to the performance standards or limits against which the
preamplifier is tested.
Typical characteristics are included for additional information only and they
are not specifications. These are denoted as "typical", "nominal" or
“approximate" and are printed in italic.
Table 2 Product Specifications for 87405C Preamplifier
Agilent Model Number 87405C
Frequency range 100 MHz to 4 GHz 4 GHz to 18 GHz
Gain, S21 25 dB
Flatness ±1.5 dB
P1dB 15 dBm 14 dBm
Noise Figure 6 dB 4.5 dB
Survival Input Power +15 dBm
Return Loss S11 15 dB 10 dB
Return Loss S22 15 dB 10 dB
Harmonics (@ +4 dBm output
power) 30 dBc typical
Impedance 50 ohms nominal
Reverse Isolation 50 dB typical
Third Order Intercept (TOI) +23 dBm typical
Power Dissipation 2.1 W typical

Specifications
Agilent 87405C Preamplifier Operating and Service
Manual
4
Table 3 General Specifications for 87405C Preamplifier
Agilent Model Number 87405C
Bias Voltage +15V ± 6% Vdc @ 140 mA nominal
-15V ± 6% Vdc @ 3 mA nominal
Connectors
RF Type N(f) in, N(m) out
DC Probe Power Connector (f)
Weight 0.22 kg (0.485 lb)
Dimension
Length 98.3 mm (0.709 inch)
Height 40.3 mm (1.587 inch)
Table 4 EMC Compliance for 87405C Preamplifier
IEC 61326:1997
EN 61326:1997
This ISM device complies with Canadian ICES-001
Line voltage interrupt (1 cycle, 100%) IEC/EN 61000-4-11
Surge test (1.2 x 50μs, 0.5 kV line-line, 1 kV line-ground) IEC/EN 61000-4-5
Electrical fast transients (0.5 kV signal lines, 1 kV power lines) IEC/EN 61000-4-4
Radiated emissions CISPR 11, Class A
EN55011
Radiated immunity (3 V/m, 80 - 1000 MHz) IEC/EN 61000-4-3
Conducted emissions CISPR 11, Class A
EN55011
Conducted immunity (3 V, 0.15 - 80 MHz) IEC/EN 61000-4-6
ESD (4 kV contact discharge, 8 kV air discharge) IEC/EN 61000-4-2

Environmental Specifications
Agilent 87405C Preamplifier Operating and Service
Manual 5
Environmental Specifications
The 87405C preamplifier is designed to fully comply with Agilent
Technologies’ product environmental specifications as shown in Table 5.
Table 5 87405C Preamplifier Environmental Specifications
Temperature:
Operating
Storage
Cycling
-45oC to +55oC
-65oC to +85oC
-65oC to +85oC , 10 cycles @ 20oC per minute, 20 minutes dwell
time per MIL-STD-833F, Method 1010.8, Condition C (modified)
Humidity:
Operating
Storage
50% to 95% RH at 40oC, 24 hour cycling, repeated 5 times
90% RH at 65oC, one 24 hour cycle
Shock:
Half-sine,
smoothed
1500 G @ 0.5 ms, 3 shock pulses per orientation, 18 total per
MIL-STD-833F, Method 2002.4, Condition B (modified)
Vibration:
Broadband
random
50 to 2000 Hz, 7.0 G rms, 15 minutes, per MIL-STD-833F,
Method 2026-1 (modified)
Altitude:
Storage <15,300 meters (50,000 feet)
Temperature
Coefficient:
Gain -0.06 dB/oC

Installation
Agilent 87405C Preamplifier Operating and Service
Manual
6
Installation
Initial Inspection 1. Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, it should be kept until the contents of
the shipment have been checked for completeness and the instrument
has been checked both mechanically and electrically.
•Check for mechanical damage such as scratches or dents.
•Procedures for checking electrical performance are given under
“Operator’s Check” or “Performance Tests’.
2. If the contents are incomplete, if there is mechanical damage or defect,
or if the instrument does not pass the electrical performance test, contact
the nearest Agilent Technologies Sales and Service office. Refer to the
Service and Support information in the front matter of this manual.
Agilent Technologies will arrange for repair or replacement of the
damaged or defective equipment. Keep the shipping materials for the
carrier’s inspection.
3. If you are returning the instrument under warranty or for service,
repackaging the instrument requires original shipping containers and
materials or their equivalents. Agilent Technologies can provide
packaging materials identical to the original materials. Refer to Service
and Support information in the front matter of this manual for the
Agilent Technologies nearest you. Attach a tag indicating the type of
service required, return address, model number, and serial number. Mark
the container FRAGILE to insure careful handling. In any
correspondence, refer to the instrument by model number and serial
number.

Operating Instruction
Agilent 87405C Preamplifier Operating and Service
Manual 7
Operating Instruction
Operator’s
Check The operator’s check is supplied to allow the operator to make a quick check
on the preamplifier prior to use or if a failure is suspected.
Description
All four s-parameters of the preamplifier are measured using a network
analyzer calibrated with the necessary settings applied.
Figure 3 Equipment Setup Using Network Analyzer
Quick-Check Procedure
The equipment setup is as illustrated in Figure 3.
1. Calibrate network analyzer using an appropriate settings and setup if
necessary.
2. Connect input of preamplifier to port 1 of network analyzer and output
to port 2.
NETWORK ANALYZER
87405C Preamplifier

Operating Instruction
Agilent 87405C Preamplifier Operating and Service
Manual
8
3. Turn on biasing to the preamplifier by connecting to power supply, ±15
V, 0.2A.
4. Measure the S11 (input return loss), S22 (output return loss) and S21
(gain). Gain flatness is the difference between maximum and minimum
gain values.
5. Compare measurement results with specifications in Table 2.

Performance Tests
Agilent 87405C Preamplifier Operating and Service
Manual 9
Performance Tests
The preamplifier can be tested to the accuracy of the specifications with a
network analyzer or equivalent equipment of suitable accuracy. If a network
analyzer is available, test the instrument using the procedure in the
analyzer’s operating manual.
Service Instructions
Repair In case your preamplier requires repair services, please contact your nearest
Agilent Sales and Service Center.
Maintenance The connectors, particularly the connector faces, must be kept clean.
For instruction on connecting and care of your connectors, refer to the
Microwave Connector Care Quick Reference Card (08510-90360).

Replaceable Parts
Agilent 87405C Preamplifier Operating and Service
Manual
10
Replaceable Parts
Table 6 lists the replaceable parts for Agilent 87405C preamplifier.
Figure 4 Drawings of Replaceable Parts for 87405C Preamplier
Table 6 Replaceable Parts for 87405C Preamplifier
Description Agilent Part Number Qty
Cable assembly - banana plug 87405-20006 1
Cable assembly - probe power cable 87405-20007 1
Cable assembly - 15-pin 87405-20010 1
87405-20006
87405-20007
87405-20010
BLACK (-15 VDC)
GREEN (GROUND)
RED (+15 VDC)
1.0 m (39.5 in)
1.0m(39.5in)
1.0 m (39.5 in)
Pin 1
Pin 1
Pin 2
Pin 3